Skip to main content

Full text of "The Morphology And Evolution Of The Apes And Man"

See other formats


THE  MUSCULAR  SYSTEM                  -20:*
hallucis arises from the head and greater part of the back of the shaft of the fibula, the septa between it ani the tibialis posticus and peroneai muscles ana the inter-osseous membrane. The tendon run* through a troehlea attached to the base of the first metatarsa! ana is inserted into the base of the lingual phalanx of the p'llex anrl capsule of the interphalangeal joint. In the Gorill.i, according to ^onimer 491^ and Hepburn '83 Loth muscles are as in Man. In the Gibbon the riexor halluci^
#
sends a tendon to each toe, and the riexcr longus digitorum gives slips to it and to the Sexor brev:<=> digitoruin. In the Orang the tiexor hallucis supplies the third and fourth toes and the flexor lonoTis digitoruin
i_J                        
supplies the second and fifth.
The abductor hallucis in the Chimpanzee arises mainly as in Man, but it also receives slips from the internal annular ligament, entocuneiform and capsule of the metatarso-phalangeal joint. It is inserted into the inner aspect of the base and shaft of the first phalanx of the hallux and the capsule of the metatarso-phalangeal joint. Within the insertion there is a sesamoid bone. In the Gibbon it is inserted as in the above: in the Orang it sends a slip to the first metatarsal bone; and it is inserted into the first phalanx in the Gorilla.
The abductor minimi digiti arises as in Man, but its insertion varies. In the Chimpanzee it is inserted into the outer and inner sides of the base of the fifth metatarsal bone, the plantar aspect of the capsule of the metatarso-phalangeal joint, and the proximal part of the shaft and base of the first phalanx of the minimus. In the other Apes the muscle is inserted into the base of the first phalanx of the minimus but additional slips are